C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
C08G 8/04 (2006.01) C08H 7/00 (2011.01) C08G 8/10 (2006.01) C08G 8/28 (2006.01) C08L 61/06 (2006.01) C08L 61/14 (2006.01) C08L 97/02 (2006.01) C09D 161/14 (2006.01) C09J 161/06 (2006.01) C09J 197/00 (2006.01) C08L 97/00 (2006.01)
Patent
CA 2355808
Disclosed is a process for preparing phenol-formaldehyde thermoset resin that can contain up to 80% by weight a black liquor, preferably a sodium carbonate black liquor. Black liquor are by-products extracted from pulping process, which normally contain lignosulfonates, kraft lignin or sodium carbonate lignin as well as salts, depending on the process that is used. The use of such a black liquor permits to obtain a stable copolymerized phenol-formaldehyde thermoset resin. In the process, the black liquor is first mixed with phenol in the pressure of a base. Then, formaldehyde is added together with a base in two successive steps. The obtained thermoset resin has bonding properties that meet or exceed the CSA and ASTM requirements for the engineered forest products, such as wafer boards or oriented strand boards.
3926044 Canada Inc.
Robic
Sudan Vikrant
LandOfFree
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